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近年来,在调查瓢虫的过程中,发现麦后大量七星瓢虫去向不明。给测报和利用带来了不少困难。为了摸清其去向,我们于1978—1979年对七星瓢虫在泰山的垂直分布进行了初步调查,结果如下。两年来,在泰山区域共调查了不同高度的山头28个、山洞45个、杂草2772平米、各种树木395株、农作物41块。6—9月份,泰山上蚜虫少,开花杂草多。麦后部分七星瓢虫逐渐向泰山上转移。1979年7月4日在杂草上调查,在海拔300米以下,平均每平方米有七星瓢虫0.5头;300—600米平均0.7头;600—1500米平均3头。7—8月七星瓢虫在海拔300米以上的杂草及柞树叶背面越夏。1978年7月底8月初在杂草上调查,海拔300米以下为零,300以上平均每平方米0.6—4.6头。蚜虫较多的中天门一般每平方米
In recent years, the ladybug in the investigation process, found a large number of post-wheat ladybug disappeared. To report and use has brought a lot of difficulties. In order to find out its whereabouts, we conducted a preliminary investigation of the vertical distribution of the ladybird ladybug in Tarzan from 1978 to 1979. The results are as follows. In the past two years, a total of 28 ravines of different heights, 45 caves, 2772 square meters of weeds, 395 trees and 41 crops were surveyed in the Taishan area. 6-9 month, Taishan less aphids, flowering weeds and more. After the wheat part of the seven-star ladybug gradually transferred to Mount Tai. July 4, 1979 Weeds survey, at an altitude of 300 meters below the average per square meter has seven ladybird ladybirds; 300-600 meters an average of 0.7; 600-1500 meters an average of three. July-August The ladybug on the back of summer weeds at more than 300 meters above sea level and oak leaves. At the end of July, 1978 and early August, the survey on weeds showed that there were no more than 300 meters above sea level and 0.6-4.6 heads per square meter above 300. Zhongtian Gate more aphids generally per square meter